Other
- Associated Talking Pictures, a British film studio of the 1930s later renamed as Ealing Studios
- Arbejdsmarkedets Tillægspension, the largest pension program in Denmark
- ATP Oil and Gas, a Texas-based oil and gas company that operates in the Gulf of Mexico and the North Sea
- American Technical Publishers, an employee-owned publishing company located in Orland Park, Illinois
- Armenia Tree Project, a non-profit organization promoting Armenia's socioeconomic development through reforestation
- Vista All Terrain Pattern, a camouflage pattern
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